Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 29

A pattern of interference fringes is produced using a red laser, a double slit and a screen. The screen is 3.5 m from the double slit. The light from the laser has a wavelength of 640 nm. The pattern of fringes is shown. What is the separation of the slits?

1. A1.2 \times 10^{-4}\ \text{m}
2. B1.6 \times 10^{-4}\ \text{m}
3. C3.1 \times 10^{-5}\ \text{m}
4. D3.3 \times 10^{-9}\ \text{m}

As printed in the paper